Concrete form



Dec. 22 1925- 7 1,566,583

(3. E. CORTES CONCRETE FORM Filed May 10, 1922 2 Shets-Sheet 1 na- I nnmminmmW' 3 nmnnmmIHHHHHIHIHL IIIIDIUHHHHM III/W INVENTOR. (4/?(05 E C'WZ'J A TTORNEYS.

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- 1,566,583 c. E. CORTES CONCRETE FORM Filed May 10, 1922 2 Sheets-Sheet 2 M A TTORNEYS.

Patented Dec. 22, 1925.

UNITED STATES CARLOS E. CORTES, OF MARTINEZ, CALIFORNIA.

CONCRETE FORM.

\ Application filed May 10, 1922. SerialI-Io. 559,706.

To all whom it. may concern:

Be it known that I, CARLos E. CORT-ES, a

citizen of the United States, and a resident of Martinez, Contra Costa Gounty, State of California, have invented certain'new and useful Concrete Forms, of which the following is a specification. The invention relates to forms for use in making hollow concrete structures, such as water pipes, pile casings and other comparable structures.

An object of the invention is to provide a form from which the concrete structure maybe readily removed after it has bee formed.

Another objectof the invention is to provide a form on which concrete is placed by impact and by which the inner and end surfaces of the concrete structure are molded.

Another object of the i-nventionis to aPlO- vide a form having means for holding reinforcement in place and whichmay be readily removed from the finished concrete structure for reuse.

The invention possesses other advantageous features, some of which, with the foregoing, will be set forth at length in the following description,where-I shall outline in full, that form of the invention which I have I selected for illustration in the drawings accompanying and forming part of the pres-.

ent specification. In said drawings, Ihave :hown one embodiment ofthe invention, but it is to be understood that the invention, as expressed in the claims, may be embodied in a plurality of forms.

Referring to said d'rawings':

Figure 1 is an elevation of one type of form of my invention, with reinforcement arranged thereon.

Fig. 2 is an end view of the form in extended position, with the end plate removed.

Fig. 3 is a plan view of the end plate.

Fig. 4 is a vertical section through the form.

Fig. 5 is an elevation of a modified type of form.

Fig. 6 is a perspective view of a modified form of core.

Fig. 7 is a cross section of a corner of a form, showing the use of the core shown in Fig. 6.

The form of my invention. comprises a collapsible cylindrical mold or core having removable end sections, which, when in place, hold the core in expanded position,

of the concrete structure.

and which, collapse.

The core shown in Fig. 2 comprises a plurality of body. segments 2, in the present instance being formed arcua'te on their outer surfaces to form a cylindrical mold, which are held in expanded or spaced position by the end plates 3l-. In the present construction I have shown three body segments having curved faces and forming a cylindrical shell. Each segment comprises a frame consisting of the segmental end sections 5 and the longitudinal member-s6, connected at their ends to the end sections, thus forming a frame, on the outer surface of which is secured a sheet metal sheathing 7. The frames have radial side edges, which, when he form is in use in expanded position, are spaced apart circu-mferentially. The spaces between the side edges of the form sections,

when removed, permit the coreto are covered by the sheathing 7, which, for

that purpose extends past the side edges of the frames.- This overlappingmargin of the sheathing may be formed on one edge of each frame, or it may be formed on both edges, both of these constructions being sl xown in the drawings.

The form sections arejheld in expanded position by-the end plates 3+4, wnich comprise a frame having a sheet metal covered margin 8, which forms a mol'clfor the ends The end plates and the ends-of the frames are provided with engaging means for holding-the fo-rin sections in expanded position. This means comprises usually dowels 9 on one member seating in apertures 12 in the other member,

each frame end being preferably provided with two dowels 9 adapted to seat in apertures in the end frame. The marginal portions 8 of the end plates projectbeyond the frames of the end plates, so that when the end plates are in position, the marginal pprtions 8 overlap the end edges of the form sections, thus definitely and positively :holding the form sections'i-n place. The marginal portions are shaped on their innersurfaces to give the desired shape tothe ends of the hollow concrete structure, in the present instance, one marginal portion being inclined to form a bevelled end and the other marginal portion being grooved to form a wedge shaped end.

Means are also provided for holding reinforcement in place on the form. The marginal portions are provided with holes13 extending therethrough, the holes being spaced outward from the face of the sheathing. The longitudinal members 14 of the reinforcing material extend through these holes, holding the reinforcing material in position in front of the sheathing.

The form, with the reinforcing in place is assembled in a manner apparent fro-m the foregoing description. The concrete is applied to the form by impact, as with a cement gun, and the form is rotated during the application of the concrete, to evenly distribute the concrete and to form a. layer of uniform thickness After the concrete has set sufliciently, one end plate is removed, the segmental forms collapsed and withdrawn andthe completed concrete structure removed from the other end plate.

In Fig. 5, I have shown a modified form of concrete form, in which the sectional forms are tapered or inclined inwardly at one end, as at 16, to form an inclined shoulder or flange on the end of the concrete structure. In this structure, a heavy circumferential reinforcing wire or bar 17 is usually placed at the shouldered end of the structure.

In Figs. 6 and 7 I have shown a modified form of core which is particularly adapted for the manufacture of concrete cylinders of smaller diameter. The core comprises a sheet 18 of metal, which may be bent into the form of a cylinder, with overlapping ends. The sheet is provided at its top and bottom edges, adjacent the side edges, with notches 19, which lie in registry when the sheetis bent to form a cylinder of the desired diameter. The end plates are provided with circular rails 21 spaced inward slightly from the end molds 8, to form channels, in which the edges of the core 18 are disposed. Arranged in the channels are pins 22 which seat in the registered notches in the core and hold the core in fixed expanded position.

I claim:

1. A collapsible concrete form comprising end plates having marginal mold sections, a collapsible core disposed between said end plates and behind said marginal sections, the surfaces of the marginal sections and the core being contiguous, means connecting the core and the end plates to hold the core in expanded position and removable means for holding reinforcement in position over the surface of the core.

2. A collapsible concrete form comprising end plates having marginal mold sections having holes therein, a. collapsible core disposed between said end plates and behind said marginal sections, the surfaces of the marginal sections and the core being contiguous, means connecting the core and the end plates to hold the core in expanded position and reinforcement overlying the surface of the core and having members extding through the holes in the marginal sections.

3. A collapsible-concrete form comprising end plates having marginal mold sections, a collapsible core disposed between said end plates and behind said marginal sections, the surfaces of the marginal sections and the core being contiguous and means connecting the core and the end plates to hold the core in expanded position, the marginal sections being provided with apertures adapted to receive and position reinforcement.

4. A collapsible concrete form comprising end plates having marginal mold sections, laterally spaced sectional mold frames disposed between said plates, sectional sheathing covering said frames and covering the spaces between said frames and means connecting the mold frames and the end plates to hold the frames in laterally spaced position.

5. A collapsible concrete form'comprising circular end plates having marglnal. mold sections, laterally spaced segmental mold frames disposed between said'plates, sheathings covering th frames and extending over the spaces between the frames to form a cylindrical mold surface and means connecting the mold frames and the end plates to hold the frames in laterally spaced position.

6. A collapsible concrete form comprising circular end plates having marginal mold sections, laterally spaced segmental mold frames disposed between said plates, sheathings covering the frames and extending over the spaces between the frames to form a cylindrical mold surface and means connecting the mold frames and the end plates to hold the frames in laterally spaced position;

said marginal sections being. provided with circumferentially spaced apertures to receive members of reinforcement and position the reinforcement over the cylindrical mold surface.

In testimony whereof, I have hereunto set my hand.

CARLOS E. ooarns. 

